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I have this code in C++ which contain two function and one main . I have difficulty to understand that. It's about merging two sorted file to third file. And the third file is as well sorted. The code working but I need an explain how it's working and will be nic if you writ it as comment .    Function1.h

I have this code in C++ which contain two function and one main . I have difficulty to understand that. It's about merging two sorted file to third file. And the third file is as well sorted. The code working but I need an explain how it's working and will be nic if you writ it as comment .    Function1.h

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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I have this code in C++ which contain two function and one main . I have difficulty to understand that. It's about merging two sorted file to third file. And the third file is as well sorted. The code working but I need an explain how it's working and will be nic if you writ it as comment . 
 
Function1.h
 
#include <iostream>
#include <fstream>
#include<string>
using namespace std;
 
bool checkFile(string file_name)
{
    ifstream file(file_name);
    string s;
    int a, b;
    //a ← read Value (A)
    file>>a;
    
    while (!file.eof())
    {
        file>>b;
        if (a > b)
        {
            return false;
        }
        a = b;
    }
    file.close();
    return true;
}
 
Function2.h 
 
void mergeFiles(string file_A,string file_B)
{
    ifstream A(file_A);
    ifstream B(file_B);
    ofstream C;
    C.open("C.txt");
    string s;
    int a, b;
    //a← read Value (A)
    //b ←read Value(B)
    B >> b;
    A>>a;
    
    while (!A.eof() && !B.eof())
    {
        if(a<=b)
        {
            C << a <<endl;
            A>>a;
        }
        else{
            C << b <<endl;
            B>>b;
        }
    }
    
    while (!A.eof())
    {
        C << a << endl;
        A >> a;
    }
    
    while (!B.eof())
    {
        C << b << endl;
        B>>b;
    }
  

    A.close();
    B.close();
    C.close();
}
 
Main.cpp
 
int main()
{

    if( checkFile("A.txt") && checkFile("B.txt"))
    {
        mergeFiles("A.txt","B.txt");
        cout<<"Files are Merged"<<endl;
    }
    else
    {
        cout<<"Files are not in sorted order to merge"<<endl;
    }
}
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